I really wish people would simply STOP arguing around each other on this point.
One side seems to be consistently arguing that you can't take ANY actions, including FREE Actions, after a Charge, on your turn, unless the action in question specifically says that you can.
The other side seems to be consistently arguing that you can take Free Actions at the start of someone else's turn, AFTER your turn ends with a charge, but BEFORE they can take any actions.
You can hold both of these positions simultaneously. I can agree with you that you CANNOT take any actions on your turn after a charge (barring listed exceptions) and STILL hold that my Free Action can be used AFTER my turn ends.
What we really need to know, and what IS NOT in the rules as written, is WHEN specific triggered Free Actions occur, and WHEN you can take Free Actions.
Does a Free Action triggered by an event on your turn also occur on your turn? We don't know. It can't occur during your End of Turn phase, because NO ACTION can be taken then. It can't occur during the next Start of Turn phase, because NO ACTIONS can be taken then. Can a Triggered Free action "fit in" before your "end of turn phase" (the period where you save against ongoing damage and conditions) but after your "turn ends". Clearly, after you make a charge attack, your turn doesn't actually END (because you get your saves and the like), but you enter your "end of turn" phase. Can the trigger happen there?
The rules tell you that Free Actions can be taken at any time, but there are specific exceptions when no actions may be taken. Can you take a free action immediately before someone takes an action on their turn?
What I keep trying to point out is that people who keep arguing the undisputed parts of their own argument, without addressing the disputed parts of someone else's argument, aren't making any useful case.
We all know that your turn ends after your charge. We all know that you can't take actions after your charge. However, clearly, a charge doesn't prevent you from ever acting again for the lifetime of your character. It just prevents you from taking any more actions on YOUR TURN.
There are tons of people who argue that the action doesn't occur on YOUR turn, but after YOUR turn. Are they right? When does a trigger resolve? When does a Free Action occur? Can we PROVE, via the rules, when a Triggered Action happens? Can we prove that it happens before but not during your End of Turn Phase? Can we prove that triggering a free action and resolving that free action occur the same time?